ref: Add/Sub Assignment Operations + e2e-tests.sh

[0xNeshi]

Resolves #445, Resolves #443

PR Checklist

• Tests
• Documentation
• Changelog

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[0xNeshi]

Add comment from Solidity version

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.6%. Comparing base (9192c18) to head (da89ce4).

Additional details and impacted files

Files with missing lines	Coverage Δ
contracts/src/access/control.rs	98.5% <ø> (ø)
contracts/src/access/ownable.rs	94.1% <ø> (ø)
contracts/src/access/ownable_two_step.rs	99.2% <ø> (ø)
contracts/src/finance/vesting_wallet.rs	55.6% <ø> (ø)
...racts/src/token/erc1155/extensions/metadata_uri.rs	78.5% <ø> (ø)
contracts/src/token/erc1155/extensions/supply.rs	81.1% <ø> (ø)
...tracts/src/token/erc1155/extensions/uri_storage.rs	98.2% <ø> (ø)
contracts/src/token/erc1155/mod.rs	96.9% <ø> (ø)
contracts/src/token/erc20/extensions/capped.rs	83.3% <ø> (ø)
contracts/src/token/erc20/extensions/metadata.rs	22.2% <ø> (ø)
... and 12 more

[0xNeshi]

The script can now be called in the following ways:

• if no arguments are passed, the behavior is the same as before
• otherwise, pass whatever arguments are present to cargo test directly

We can now easily filter for even unit tests with this script.

This should cover most of our testing needs.

NOTE: feel free to suggest or add any additional feature you think might be useful.

[0xNeshi]

An other option is to omit the if-statement, and just call cargo test --features std,e2e "$@", passing whatever arguments to the command. In our e2e workflow, we'd then call the script like ./scripts/e2e-tests.sh --test "*".

I'd be more in favor of this approach, but my first instinct was to keep the existing behavior as much as possible, and only change it after discussing it with you guys.

At this point it's really a matter of taste

[bidzyyys]

I believe we can apply #[allow(clippy::used_underscore_binding)] for the whole contracts library